Bacteriology is a branch of microbiology that focuses on the study of bacteria, which are single-celled microorganisms that belong to the domain Bacteria. Bacteria are diverse and ubiquitous, inhabiting virtually every environment on Earth, including soil, water, air, and living organisms. Bacteriology encompasses various aspects of bacterial biology, including their morphology, physiology, genetics, ecology, and interactions with other organisms.

List of Sub-Topics in Bacteriology:

• Introduction
• Scope of Study
• Importance of Study
• Early Studies and Pioneers
• Milestones in the Development
• Applications and Future Development
• Conclusion
• Related Topics

Biology is a branch of science which studies living beings that all plants and animals including humans. It is a word derived from Greek words (Greek: bios = life; logos = study). No one can say when the study of biology exactly began but Greeks can be considered as the pioneer of an organized study of this branch of science.

Zoology is the branch of biology that focuses on the scientific study of animals. It encompasses a wide range of topics related to the biology, behaviour, evolution, ecology, physiology, and classification of animals, from microscopic organisms to large mammals. Zoologists study various aspects of animal life, including their anatomy, genetics, development, reproduction, and interactions with their environments. It plays a crucial role in advancing scientific knowledge, informing conservation efforts, and promoting stewardship of the Earth’s biodiversity.

Bacteriology is a branch of microbiology that focuses on the study of bacteria, which are single-celled microorganisms that belong to the domain Bacteria. Bacteria are diverse and ubiquitous, inhabiting virtually every environment on Earth, including soil, water, air, and living organisms. Bacteriology encompasses various aspects of bacterial biology, including their morphology, physiology, genetics, ecology, and interactions with other organisms.

Scope of the Study of Bacteriology:

The scope of study in bacteriology is vast and encompasses various aspects of bacteria and their interactions with other organisms and the environment. Here are some key areas within the scope of bacteriology:

• Bacterial Morphology and Structure: Bacteriologists study the morphology (size, shape, and arrangement) and structure (cell wall composition, flagella, pili, capsules) of bacteria using microscopy and other techniques. Understanding bacterial morphology and structure is crucial for bacterial identification, classification, and characterization.
• Bacterial Physiology and Metabolism: Bacteriologists investigate the metabolic pathways and biochemical processes that enable bacteria to grow, reproduce, and survive in different environments. This includes the study of nutrient uptake, energy production, respiration, fermentation, and the synthesis of cellular components.
• Bacterial Genetics and Molecular Biology: Bacteriologists study bacterial genetics and molecular biology to understand how genetic information is encoded, replicated, expressed, and regulated in bacteria. This includes the study of bacterial chromosomes, plasmids, gene regulation mechanisms, horizontal gene transfer, and genetic variation.
• Bacterial Ecology and Environmental Microbiology: Bacteriologists explore the ecological roles of bacteria in natural environments, including their interactions with other organisms and their contributions to biogeochemical cycles, nutrient cycling, and ecosystem processes. Environmental bacteriology encompasses studies of soil bacteria, aquatic bacteria, airborne bacteria, and bacteria associated with plants, animals, and humans.
• Bacterial Pathogenesis and Host-Pathogen Interactions: Bacteriologists study bacterial pathogens and their interactions with host organisms to understand the mechanisms of bacterial infections and diseases. This includes the study of bacterial virulence factors, host immune responses, bacterial evasion strategies, and the development of antibacterial therapies and vaccines.
• Applied Bacteriology and Biotechnology: Bacteriology has numerous applications in biotechnology, industry, and medicine. Bacteriologists develop and apply bacterial strains for various purposes, including food production, bioremediation, wastewater treatment, biopharmaceutical production, and genetic engineering. Bacteriology also plays a role in the diagnosis, treatment, and prevention of bacterial infections in clinical settings.
• Food Microbiology and Food Safety: Bacteriologists study bacteria associated with food production, processing, and spoilage, as well as foodborne pathogens that can cause foodborne illnesses. Understanding food microbiology is essential for ensuring food safety, quality control, and the development of preservation methods to extend the shelf life of food products.

Bacteriology is a diverse and multidisciplinary field that encompasses a wide range of research areas and applications. By studying bacteria and their biology, bacteriologists contribute to our understanding of microbial life, ecosystem functioning, human health, and the development of technologies to address societal challenges.

Importance of the Study of Bacteriology:

Studying bacteriology is of immense importance due to several reasons, as bacteria play crucial roles in various aspects of life, including human health, agriculture, industry, and the environment. Here are some key reasons why the study of bacteriology is important:

• Human Health: Bacteria can cause a wide range of diseases in humans, including respiratory infections, gastrointestinal illnesses, skin infections, and sexually transmitted infections. Understanding the biology, virulence mechanisms, and antibiotic resistance of pathogenic bacteria is essential for the diagnosis, treatment, and prevention of bacterial infections.
• Infectious Disease Control: Bacteriology plays a vital role in public health by contributing to the surveillance, monitoring, and control of infectious diseases caused by bacteria. This includes the development of diagnostic tests, antimicrobial therapies, vaccines, and public health interventions to prevent and control the spread of bacterial infections and outbreaks.
• Antimicrobial Resistance: The emergence and spread of antimicrobial-resistant bacteria pose a significant threat to global health. Bacteriology research is crucial for understanding the mechanisms of antimicrobial resistance, identifying resistant bacteria, developing new antibiotics and alternative therapies, and implementing strategies to combat antimicrobial resistance and preserve the effectiveness of existing antimicrobial agents.
• Food Safety and Quality: Bacteriology is essential for ensuring the safety and quality of food products. Bacteria can contaminate food during production, processing, storage, and distribution, leading to foodborne illnesses. Bacteriological testing and monitoring help identify foodborne pathogens, spoilage organisms, and indicators of food hygiene, facilitating the implementation of food safety measures and quality control practices.
• Agriculture and Veterinary Medicine: Bacteria play critical roles in agriculture and veterinary medicine, both as beneficial symbionts and as pathogens. Bacteriology research contributes to the development of strategies for disease prevention, biocontrol of plant pests and diseases, animal health management, and the sustainable use of antibiotics and antimicrobial agents in livestock production.
• Biotechnology and Industrial Applications: Bacteria have numerous biotechnological and industrial applications, including the production of enzymes, biofuels, biopolymers, pharmaceuticals, and biopharmaceuticals. Bacteriology research enables the genetic engineering, optimization, and scale-up of bacterial strains for industrial processes, bioremediation, and environmental applications.
• Environmental Microbiology: Bacteria play essential roles in environmental processes such as nutrient cycling, decomposition, and bioremediation. Bacteriology research helps understand the ecological functions of bacteria in natural ecosystems, assess microbial diversity and community structure, and develop microbial-based technologies for environmental protection and remediation.

The study of bacteriology is essential for advancing our understanding of bacteria and their interactions with humans, animals, plants, and the environment. By elucidating the biology, ecology, and impact of bacteria, bacteriology contributes to improving human health, food safety, agricultural productivity, industrial processes, and environmental sustainability.

Early Studies and Pioneers in Bacteriology:

The field of bacteriology has been shaped by the contributions of pioneering scientists who made significant discoveries and laid the groundwork for our understanding of bacteria and their role in health, disease, and the environment. Here are some early studies and key figures in the history of bacteriology:

• Antonie van Leeuwenhoek (1632–1723): A Dutch tradesman and scientist, van Leeuwenhoek is often considered the father of microbiology. Using simple microscopes of his own design, he made ground breaking observations of microorganisms, including bacteria, in samples of water, dental plaque, and other materials. His meticulous observations laid the foundation for the study of microscopic life.
• Louis Pasteur (1822–1895): A French chemist and microbiologist, Pasteur made numerous contributions to the field of bacteriology. He demonstrated that fermentation was caused by microorganisms and developed the process of pasteurization to prevent food spoilage. Pasteur also conducted pioneering research on infectious diseases, including anthrax and rabies, and developed vaccines against these diseases.
• Robert Koch (1843–1910): A German physician and microbiologist, Koch is considered one of the founders of modern bacteriology. He established the principles of bacteriological investigation, known as Koch’s postulates, which are used to establish the causative agent of infectious diseases. Koch’s work on anthrax, tuberculosis, and cholera laid the foundation for the germ theory of disease and the development of microbiological techniques.
• Joseph Lister (1827–1912): A British surgeon, Lister is known for pioneering antiseptic surgical techniques to prevent infections during surgery. He introduced the use of carbolic acid (phenol) as a disinfectant to sterilize surgical instruments and clean wounds, significantly reducing postoperative infections and mortality rates.
• Ferdinand Cohn (1828–1898): A German biologist, Cohn is considered one of the founders of modern bacteriology and microbial ecology. He was the first to classify bacteria into different genera based on their morphology and physiology. Cohn also made important contributions to the study of bacterial endospores, bacterial growth, and the ecology of microorganisms in natural environments.
• Louis Antoine Ranvier (1835–1922): A French anatomist and histologist, Ranvier made significant contributions to the study of bacterial morphology and the structure of bacterial cells. He developed staining techniques, such as the use of aniline dyes, to visualize bacteria under the microscope and study their cellular structures.
• Richard Julius Petri (1852–1921): A German bacteriologist, Petri is best known for inventing the Petri dish, a shallow glass or plastic dish with a lid that is used to culture and observe bacteria and other microorganisms. The Petri dish revolutionized microbiology by providing a simple and effective method for isolating and studying bacteria in laboratory settings.

These early studies and pioneering figures laid the foundation for the field of bacteriology and shaped our understanding of bacteria and their importance in health, disease, and the environment. Their contributions paved the way for subsequent advancements in microbiology and the development of techniques and technologies for studying bacteria and their interactions with other organisms.

Milestones in the Development of Bacteriology:

The development of bacteriology as a scientific discipline has been marked by several significant milestones, each contributing to our understanding of bacteria and their role in health, disease, and the environment. Here are some key milestones in the development of bacteriology:

• Discovery of Microorganisms (17th Century): Antonie van Leeuwenhoek’s observations of microorganisms using simple microscopes in the late 17th century marked the beginning of bacteriology. His discoveries paved the way for the study of microscopic life and laid the foundation for the field of microbiology.
• Germ Theory of Disease (19th Century): The germ theory of disease, proposed by Louis Pasteur and Robert Koch in the 19th century, revolutionized our understanding of infectious diseases. Pasteur demonstrated that microorganisms were responsible for fermentation and developed vaccines against diseases such as anthrax and rabies. Koch established the principles of bacteriological investigation, known as Koch’s postulates, which are used to establish the causative agent of infectious diseases.
• Discovery of Antibiotics (20th Century): The discovery of antibiotics, beginning with Alexander Fleming’s discovery of penicillin in 1928, revolutionized the treatment of bacterial infections. Penicillin and subsequent antibiotics, such as streptomycin and tetracycline, saved countless lives and transformed medicine. The discovery and development of antibiotics marked a major milestone in the history of bacteriology and medicine.
• Development of Microbiological Techniques (Late 19th to 20th Century): The development of microbiological techniques, such as staining methods, culture techniques, and microscopy, facilitated the study and identification of bacteria. Techniques such as the Gram stain, developed by Hans Christian Gram in 1884, and the Petri dish, invented by Richard Julius Petri in the late 19th century, revolutionized microbiological research and laboratory practice.
• Advancements in Molecular Biology (20th Century): The advent of molecular biology techniques, such as DNA sequencing, polymerase chain reaction (PCR), and recombinant DNA technology, transformed bacteriology research. These techniques allowed scientists to study bacterial genetics, gene expression, and molecular mechanisms of pathogenesis with unprecedented precision and detail.
• Emergence of Antibiotic Resistance (20th Century): The emergence and spread of antibiotic-resistant bacteria represent a major challenge in modern bacteriology. Antibiotic resistance threatens the effectiveness of antibiotics and complicates the treatment of bacterial infections. Understanding the mechanisms of antibiotic resistance and developing strategies to combat it are ongoing areas of research in bacteriology.
• Environmental Microbiology and Biotechnology (20th Century): Bacteriology research expanded to include environmental microbiology and biotechnology applications. Bacteria play crucial roles in environmental processes, such as nutrient cycling, bioremediation, and wastewater treatment. Bacteriology also contributes to biotechnological applications, including the production of enzymes, biofuels, and biopharmaceuticals.
• Genomics and Metagenomics (21st Century): The advent of genomics and metagenomics has revolutionized the study of bacteria and microbial communities. Whole-genome sequencing and metagenomic analysis techniques allow scientists to study bacterial genomes, gene functions, and microbial diversity in various environments. These advancements have expanded our understanding of bacterial ecology, evolution, and interactions with other organisms.

These milestones represent key advancements in the field of bacteriology that have shaped our understanding of bacteria and their importance in health, disease, and the environment. Ongoing research in bacteriology continues to uncover new insights into bacterial biology, pathogenesis, antibiotic resistance, and environmental microbiology, driving further advancements in the field.

Applications and Future Development of Bacteriology:

Bacteriology has numerous applications across various fields and continues to be a dynamic and evolving discipline. Here are some current applications of bacteriology and potential future developments:

• Infectious Disease Diagnosis and Treatment: Bacteriology plays a crucial role in the diagnosis and treatment of infectious diseases caused by bacteria. Bacteriological testing, including culture-based methods, molecular diagnostics, and antimicrobial susceptibility testing, is essential for identifying bacterial pathogens and determining appropriate antibiotic treatment regimens. Future developments may include the development of rapid diagnostic tests, point-of-care diagnostics, and novel antimicrobial agents to combat antibiotic-resistant bacteria.
• Vaccine Development: Bacteriology research contributes to the development of vaccines against bacterial pathogens. Vaccines prevent bacterial infections and reduce the spread of antibiotic-resistant bacteria. Bacteriologists are working to develop new vaccines against bacterial diseases such as tuberculosis, meningitis, pneumonia, and diarrheal diseases. Future developments may include the development of universal vaccines capable of providing broad protection against multiple bacterial pathogens.
• Antimicrobial Resistance Surveillance and Control: Bacteriology plays a critical role in monitoring and controlling antimicrobial resistance, which poses a significant threat to global health. Bacteriologists study the mechanisms of antimicrobial resistance, identify resistant bacteria, and develop strategies to prevent the spread of resistance genes. Future developments may include the development of new antimicrobial agents, combination therapies, and alternative treatment approaches to combat antimicrobial-resistant bacteria.
• Food Safety and Quality Assurance: Bacteriology is essential for ensuring the safety and quality of food products. Bacteriological testing is used to detect foodborne pathogens, spoilage organisms, and indicators of food hygiene in food production and processing facilities. Bacteriologists work to develop and implement food safety measures, including hazard analysis and critical control point (HACCP) plans, to prevent foodborne illnesses and ensure the safety of food products.
• Bioremediation and Environmental Protection: Bacteriology research contributes to the development of bioremediation technologies for environmental cleanup and pollution control. Bacteria play crucial roles in degrading pollutants, detoxifying contaminants, and restoring ecosystems affected by environmental pollution. Bacteriologists study microbial communities in contaminated environments and develop strategies to enhance microbial degradation of pollutants. Future developments may include the use of genetically engineered bacteria and microbial consortia for targeted bioremediation applications.
• Biotechnology and Industrial Applications: Bacteriology has numerous biotechnological and industrial applications, including the production of enzymes, biofuels, biopolymers, and pharmaceuticals. Bacteriologists develop and optimize bacterial strains for industrial processes, fermentation, and bioproduction. Future developments may include the development of novel biocatalysts, metabolic engineering strategies, and synthetic biology approaches to enhance bacterial productivity and yield in industrial applications.
• One Health Approach: Bacteriology contributes to the One Health approach, which recognizes the interconnectedness of human, animal, and environmental health. Bacteriologists study zoonotic bacteria that can be transmitted between animals and humans, monitor antimicrobial resistance in both human and animal populations, and assess the impact of environmental factors on bacterial ecology and transmission dynamics.

Bacteriology is a dynamic and multidisciplinary field with diverse applications in medicine, public health, agriculture, biotechnology, environmental science, and industry. Future developments in bacteriology are likely to be driven by advances in technology, genomics, molecular biology, and interdisciplinary collaborations, leading to innovations in infectious disease control, antimicrobial therapy, food safety, environmental protection, and biotechnological applications.

Conclusion:

Bacteriology stands as a vital and dynamic field with far-reaching implications for human health, agriculture, industry, and the environment. Through the study of bacteria, bacteriologists have made significant strides in understanding the fundamental principles of microbial life, bacterial ecology, pathogenesis, and antimicrobial resistance. This knowledge has led to the development of diagnostic tests, vaccines, antimicrobial therapies, and biotechnological applications that have transformed medicine, public health, and biotechnology. The ongoing threat posed by infectious diseases, antimicrobial resistance, and foodborne illnesses underscores the continued importance of bacteriology in addressing global health challenges. Bacteriologists play a crucial role in monitoring, preventing, and controlling bacterial infections through surveillance, research, and the development of interventions.

Looking ahead, the future of bacteriology holds immense promise for further advancements and innovations. Emerging technologies such as genomics, metagenomics, synthetic biology, and high-throughput screening are revolutionizing the field, enabling researchers to unravel the complexities of bacterial biology with unprecedented precision and detail. Interdisciplinary collaborations across fields such as microbiology, immunology, bioinformatics, and environmental science are driving new discoveries and approaches to combat bacterial diseases, antimicrobial resistance, and environmental pollution. Moreover, the One Health approach, which recognizes the interconnectedness of human, animal, and environmental health, underscores the importance of bacteriology in addressing complex health challenges. By studying bacteria and their interactions with hosts, vectors, and the environment, bacteriologists can contribute to the development of holistic strategies for disease prevention, surveillance, and control.

In essence, bacteriology remains at the forefront of scientific research and innovation, shaping our understanding of bacteria and their impact on life on Earth. By continuing to push the boundaries of knowledge and collaborating across disciplines, bacteriologists hold the key to unlocking new insights into bacterial biology and developing solutions to address current and future challenges posed by bacterial diseases, antimicrobial resistance, and environmental pollution.

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In the previous article, we have studied the importance of biology. In this article, we shall study different branches of biology.

On the Basis of Kind of Organism:

Depending upon the kind of organism, the branches of biology are as follows:

• Botany: Botany is the scientific study of plants which include algae, fungi, lichens, mosses, ferns, conifers, and flowering plants.
• Zoology:  Zoology involves the study of animals including their classification, their history, their anatomy, and physiology,
• Microbiology: Microbiology is the study of all living organisms that are too small to be visible to the naked eye. This includes bacteria, archaea, viruses, fungi, prions, protozoa, and algae, collectively known as ‘microbes’.
• Human Biology: Human biology is the branch of biology that deals with human beings and human populations. It includes all the aspects of the human as an organism including genetics, ecology, anatomy and physiology, anthropology, and nutrition. Human biology is related to other fields of biology such as medicine, primate biology, and biological anthropology.

On the Basis of Group of Organisms:

Depending upon the group of organisms under the study, the branches of biology are as follows:

• Bacteriology: The science and study of bacteria and their relation to medicine and to other areas such as agriculture (e.g., farm animals) and the industry is called Bacteriology.
• Virology: Virology is the study of viruses and virus-like agents, including (but not limited to) their taxonomy, disease-producing properties, cultivation, and genetics. It is often considered a part of microbiology or pathology.
• Mycology: Mycology is the branch of biology that deals with the study of fungi. It includes the research of their genetic and biochemical properties and their use in medicine and food along with their hazards.
• Entomology: Entomology is a branch of zoology that studies insects and how they interact with their environment, other species and humans.
• Ichthyology: Ichthyology is the branch of zoology devoted to the study of fishes, which includes bony fish (Osteichthyes), cartilaginous fish (Chondrichthyes), and jawless fish (Agnatha).
• Herpetology: Herpetology is the branch of zoology concerned with the study of amphibians,  reptiles. Batrachology is a further subdiscipline of herpetology concerned with the study of amphibians only.
• Ornithology: Ornithology is the scientific field dedicated to the study of birds.

On the Basis of Approach to Study:

Depending upon the approach of the study, the branches of biology are as follows:

• Anatomy: It is the scientific study focusing on the physical structures and parts of organisms (plants and animals).
• Morphology: Morphology is a branch of biology dealing with the study of the form and structure (internal and external)  of organisms and their specific structural features
• Histology: Histology is the scientific study of the fine detail of biological cells and tissues using microscopes
• Cytology: The study of structure and function of plant and animal cells.
• Physiology: The branch of biology dealing with the functions and activities of living organisms and their parts, including all physical and chemical processes is called physiology.
• Embryology: Embryology is the study of the development of an embryo from the stage of ovum fertilization through to the fetal stage.
• Taxonomy or Systematics: The science of identifying, naming, grouping and classifying plants and animals is called taxonomy or systematics.
• Ecology: Ecology is the scientific study of the interactions between organisms and their environment.
• Biogeology: The study of the interaction between the Earth’s biosphere and the lithosphere.
• Biogeography: Biogeography is a study of the distribution of various species and ecosystems geographically and throughout geological time and space.
• Paleontology:  the study of fossils to determine the structure and evolution of extinct animals and plants and the age and conditions of deposition of the rock strata in which they are found is called Palaeontology.
• Evolution: evolution is the branch of biology which studies the change in the characteristics of a species over several generations and relies on the process of natural selection.
• Genetics: Genetics is a branch of biology that deals with heredity and variations.
• Parasitology: Parasites are those organisms that live on or inside other organisms called the host and draw nourishment from the host are called parasites. The study of parasites is called parasitology. It includes the study of three major groups of animals: parasitic protozoa, parasitic helminths (worms), and those arthropods that directly cause disease or act as vectors of various pathogens.
• Pathology: It is a branch of biology which studies diseases in plant and animals and their treatment.
• Immunology: The immune system protects us from infection through various lines of defense. Immunology is the study of the immune system.
• Eugenics: The study of or belief in the possibility of improving the qualities of the human species or a human population, especially by such means as discouraging reproduction by persons having genetic defects or presumed to have inheritable undesirable traits. Thus it is a science which aims to improve the human race through controlled heredity.
• Biochemistry: Biochemistry is the study of the processes behind all living organisms,

On the Basis of Agriculture and Allied Industries:

With respect to agriculture and allied industries, the branches of biology are as follows:

• Agriculture: It is a branch of biology which deals with raising crops and live stocks such as cows, buffaloes, etc.
• Veterinary Science:  The branch of medicine that deals with the causes, diagnosis, and treatment of diseases and injuries of animals, especially domestic animals.
• Marine Biology: Marine biology is the study of marine organisms, their behaviours, and their interactions with the environment.
• Horticulture: Horticulture is the science and art of producing, improving, marketing, and using fruits, vegetables, flowers, and ornamental plants.
• Animal Husbandry: It is the branch of agriculture concerned with animals that are raised for meat, fibre, milk, eggs, or other products. It includes day-to-day care, selective breeding and the raising of livestock like cows, buffaloes, etc.
• Sericulture: Sericulture, or silk farming, is the rearing of silkworms for the production of raw silk.
• Pisciculture: The breeding, rearing, and transplantation of fish by artificial means is called pisciculture.
• Tissue Culture: Tissue culture, a method of biological research in which fragments of tissue from an animal or plant are transferred to an artificial environment in which they can continue to survive and function.
• Molecular Biology: Molecular biology is a branch of science concerning biological activity at the molecular level. The field of molecular biology overlaps with biology and chemistry and in particular, genetics and biochemistry.
• Biotechnology: Biotechnology is the use of biological processes, organisms, or systems to manufacture products intended to improve the quality of human life.
• Cloning: Cloning is a process of asexual reproduction to create offspring that are genetically identical to the parent.
• Bioengineering: It is the branch of biology which with the help of engineering science help in making artificial limbs, joints and other parts of the body using engineering materials and techniques. It also includes the improvement of crops for disease resistance and yield.
• Biomedical Engineering: Biomedical engineering is the application of engineering principles to the fields of biology and health care. Biomedical engineers work with doctors, therapists and researchers to develop systems, equipment, and devices in order to solve clinical problems. The job includes the design, development, production, and maintenance of medical instruments.
• Nuclear biology: Nuclear biology or radiobiology is a branch of biology which studies the effect of radioactivity on living cell and also deals with the development and production of nuclear medicines for diagnosis and treatment of the diseases.
• Space Biology: The study of the survival of living things in a space is called space biology.
• Genomics: Genomics is a study of the genomes of organisms. Its main task is to determine the entire sequence of DNA or the composition of the atoms that make up the DNA and the chemical bonds between the DNA atoms.
• Bioinformatics: Bioinformatics is the application of information technology to the study of living things, usually at the molecular level. Bioinformatics involves the use of computers to collect, organize and use biological information to answer questions in fields like evolutionary biology.
• Biometrics: Biometrics is a technological and scientific authentication method based on biology and used in information assurance (IA). Biometric identification authenticates secure entry, data or access via human biological information such as DNA or fingerprints.
• Forensic science: The forensic sciences are used around the world to resolve civil disputes, to justly enforce criminal laws and government regulations, and to protect public health. The field of forensic science depends on other branches of science, including physics, chemistry, and biology, with its focus being on the recognition, identification, and evaluation of physical evidence. It has become an essential part of the judicial system to achieve information relevant to criminal and legal evidence.
• Genetic Engineering: Genetic engineering refers to the direct manipulation of DNA to alter an organism’s characteristics (phenotype) in a particular way.

On the Basis of Medical Sciences:

On basis of medical sciences, the branches of biology are as follows:

• Gynecology and Obstetrics: Gynaecology normally means treating women who aren’t pregnant, while obstetrics deals with pregnant women and their unborn children, but there is lots of crossover between the two.
• Orthopedics: It is a branch of medical science which is devoted to the diagnosis, treatment, prevention, and rehabilitation of injuries, disorders, and diseases of the body’s musculoskeletal system. This system includes bones, joints, ligaments, muscles, nerves, and tendons.
• Opthalmology: It is the branch of medicine that deals with the anatomy, physiology, and diseases of the eyeball and orbit.
• Dentistry: It is a branch of medicine that consists of the study, diagnosis, prevention, and treatment of diseases, disorders, and conditions of the oral cavity.
• Oncology: Oncology is the branch of medicine that researches, identifies and treats cancer.
• Cardiology: Cardiology is a branch of medicine that concerns diseases and disorders of the heart, which may range from congenital defects through to acquired heart diseases such as coronary artery disease and congestive heart failure.
• Urology: Urology is a surgical specialty that deals with the treatment of conditions involving the male and female urinary tract and the male reproductive organs.
• Nephrology: Nephrology is a branch of medical science that deals with diseases of the kidneys.
• Pediatrics: Pediatrics is the branch of medicine dealing with the health and medical care of infants, children, and adolescents from birth up to the age of 18.
• Dermatology: Dermatology is the branch of medicine dealing with diagnosing and treating skin diseases affecting the skin, hair, and nails.
• Physiotherapy: Physiotherapy is a branch of medicine which uses a treatment method that focuses on the science of movement and helps people to restore, maintain and maximize their physical strength, function, motion and overall well-being by addressing the underlying physical issues.

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